From
Slashdot:
"CNET is reporting that IE7 will be pushed to users via Windows Update. This has serious implications for e-commerce websites whose functionality might be affected by any bugs in the software. Also to have end users suddenly using a new browser right before the holiday shopping season could magnify the cost any bugs that might create a bad user experience on sites."
It's a good idea, in general, but it's sort of scary for such a massive amount of people to be changing to a new, somewhat-tested browser all at once..